In electro-magnetic annunciators for hotels



0. HAGENDDRF. Electro-Magnetic Annunciators for Hotels, &c. No. 134,053,` Patented Dec.17,1872.

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PATENT {Orr-*Ion OTTO uaennnonr, or New vonk', n. r.

IMPROVEMENT IN ELECTRO-MAGNETIC ANNUNCIATORS FOR HOTELS, &c.

Specification forming part of Letters Patent No. 134,053, dated December 17, 1872.

To all 'whom it may concern:

Beit known that I, OTTO HAGENDORF, of the city, county, and State of New York, have invented a new-and Improved Electro-Magnetic Hotel-Annunciator; and I do hereby declare the following to be a full, clear, and exact description thereof, which will enable those skilled in the art to make and use the same, reference being had to the accompany' ing drawing forming a part of this specification, in which drawing- Figure 1 represents a front view ofthe working parts when the announcing-disk is turned back; Fig. 2 is a similar view ofthe same when the announcing-disk is dropped in position to exhibit its figure; Fig. 3 is a face view of my apparatus complete 5 and Fig. 4 is a transverse section of the same in the plane a; m, Fig. 2.

Similar lettersindicate corresponding parts.

This invention consists in the arrangement of an announcing-disk on a lever, which,'whe11 left to follow its 'own gravity, drops in such a position that the announcing-disk .is brought behind a iigure painted in dark color on a transparent surface, and that by bringing said disk in this position the figure is rendered plainly visible. With the announcing-disk lever is combined a recovering-slide and the armature of an electro-magnet, and if the recovering-slide is moved inthe proper direction the announcing-disk lever catches over a' pin projecting from the armature, and thereby the announcing-disk is locked back until the circuit through the electro-magnet is closed. The spring of the armature is constructed of a straight and a curved strip, so that it is capable of withstanding the various strains to which it is exposed. f

In the drawing, the letter Afdesignates a box, which incloses the working mechanism of my annunciator. The front or face of this p box is made of glass,'or other transparent material, which is painted black on its inside,

' with the exception of spaces a, on which are painted the figures of the several rooms in dark colors, (see Figs. 3 and 4.) If the box is secured to the wall these figures are not visible unless a light object is brought behind the space or spaces a of 'such figures as are to be exhibited. This light .object I have termed the announcing-disk in my apparatus,

" and this disk is mounted on a lever, B, which is hung in such a manner that, when it is left to follow its inherent gravity, it drops in the position shown in Fig. 2, carrying the announcing-disk behind the space a, Fig. 3. From the lever B extends an arm, b, which is provided with a hook, c, intended to catch over a pin, d, that projects from the edge of the armature C of an electromagnet, D, and by this pin the lever B is retained in the position shown in Fig. 1, throwing the announcing-disk back out of the way of the space a, and consequently the figure on said space is not visible.

As soon as the circuit through the electro-magnet is closed, the armature C is attracted, the lever B is released, and the disk drops down in its announcing position.

With thelevers B of the several announcingdisks is combined a recoveringslide, E, which, when pulled out, acts on the tail e of each lever and carries the same back to its locking position, the hooks c being sol constructed that they catch automatically over the lockin g-pins of the armatures whenever the recovering-slide is pulled back far enough.

The armature C is ysecured to a spring, f, which is composed of a straight and a curved strip of sheet metal, and which, on account of this peculiar construction, is rendered durable and not liable to lose its elasticity, as it is strained in various directions by the electromagnet and by the hook of the lever B.

The circuit through each ofthe electro-magnets of my hotel-annunciator is closed by pulling` or turning a suitable key arranged for this purpose in each room of the hotel.

Wheneverthis key is set in motion in one of the rooms, the announcing-disk correspon ding to the gure or number of said room is allowed to drop, and the number of the roomis rendered visible. The recovering-slide acts on all the levers of those announcing-disks which have been dropped.

If desired, the iigures or numbers may be made on the announcing-disk, and the spaces a, in this case, are left blank.

What I claim as new, and desire to secure by Letters Patent, is-

l. In an electric-annunciator, a bell-crank or T-shaped lever, B, or its equivalent, provided magnet and a lever carrying an announcingdisk, substantially as set forth.

4. In an electric-annunciator, a bell-crank or T-shaped lever, or its equivalent, provided With a tail, e, in combination with a recovering-slide, E, substantially as and for the purpose set forth.

OTTO HAGENDORF.

Witnesses:

W. HAUFF, E. F. KASTENHUBER. 

